A5007939743- Metamaterials and Metasurfaces Applications
- Photonic and Optical Devices
- Plasmonic and Surface Plasmon Research
- Advanced Antenna and Metasurface Technologies
- Mechanical and Optical Resonators
- Thermal Radiation and Cooling Technologies
- Advanced Fiber Laser Technologies
- Photonic Crystals and Applications
- Neural Networks and Reservoir Computing
- Random lasers and scattering media
- Quantum Mechanics and Non-Hermitian Physics
- Quantum optics and atomic interactions
- Geophysics and Sensor Technology
- Orbital Angular Momentum in Optics
- Nonlinear Photonic Systems
- Advanced Fiber Optic Sensors
- Terahertz technology and applications
- Topological Materials and Phenomena
- Photorefractive and Nonlinear Optics
- Strong Light-Matter Interactions
- Advanced Materials and Mechanics
- Structural Analysis and Optimization
- Modular Robots and Swarm Intelligence
- Optical Network Technologies
- Cold Atom Physics and Bose-Einstein Condensates
The Graduate Center, CUNY
2021-2024
CUNY Advanced Science Research Center
2021-2024
Imperial College London
2017-2024
City University of New York
2021-2024
Advanced Science Research Center
2024
Heidelberg University
2017
University of Parma
2017
Istituto Nazionale di Fisica Nucleare, Sezione di Milano Bicocca
2017
Time-varying media have recently emerged as a new paradigm for wave manipulation, thanks to thesynergy between the discovery of novel, highly nonlinear materials, such epsilon-near-zero and questfor novel applications, magnet-free nonreciprocity, multi-mode light shaping, ultrafast switching. Inthis review we provide comprehensive discussion recent progress achieved with photonic metamaterials whoseproperties stem from their modulation in time. We basic concepts underpinning temporal...
A moving medium drags light along with it as measured by Fizeau and explained Einstein's theory of special relativity. Here we show that the same effect can be obtained in a situation where there is no physical motion medium. Modulations both permittivity permeability, phased space time form travelling waves, are basis our model. Space-time metamaterials represented effective bianisotropic parameters, which turn mapped to homogeneous Hence these mimic relativistic without need for any actual...
Abstract Recent progress in nanophotonics and material science has inspired a strong interest optically-induced dynamics, opening new research directions the distinct fields of Floquet matter time metamaterials. phenomena are historically rooted condensed community, as they exploit periodic temporal drives to unveil novel phases matter, unavailable systems at equilibrium. In parallel, field metamaterials been offering platform for exotic wave based on tailored materials nanoscale, recently...
properties of the optical surface plasmons in microwave and terahertz frequencies using subwavelength artificial structures to construct negative permittivity.The spoof also benefit from realization ultrathin corrugated metallic strips [14], as they are compatible with printed circuit boards (PCBs) integrated technologies.Since propagating localized were experimentally realized PCBs 2013 2014 [14, 15], this area flourishes prospective applications emerging circuits, sensing, wireless...
Time has emerged as a new degree of freedom for metamaterials, promising pathways in wave control. However, electromagnetism suffers from limitations the modulation speed material parameters. Here we argue that these can be circumvented by introducing traveling-wave modulation, with same phase velocity waves. We show how luminal metamaterials generalize parametric oscillator concept, realize giant broadband nonreciprocity, achieve efficient one-way amplification, pulse compression, and...
The theory of homogenization material parameters has been a cornerstone in the development metamaterials. conventional framework, however, is not applicable to $s\phantom{\rule{0}{0ex}}p\phantom{\rule{0}{0ex}}a\phantom{\rule{0}{0ex}}t\phantom{\rule{0}{0ex}}i\phantom{\rule{0}{0ex}}o\phantom{\rule{0}{0ex}}t\phantom{\rule{0}{0ex}}e\phantom{\rule{0}{0ex}}m\phantom{\rule{0}{0ex}}p\phantom{\rule{0}{0ex}}o\phantom{\rule{0}{0ex}}r\phantom{\rule{0}{0ex}}a\phantom{\rule{0}{0ex}}l$ metamaterials that...
In order to confine waves beyond the diffraction limit, advances in fabrication techniques have enabled subwavelength structuring of matter, achieving near-field control light and other types waves. The price is often expensive needs irreversibility device functionality, as well introduction impurities, a major contributor losses. this Letter, we propose temporal inhomogeneities, such periodic drive electromagnetic properties surface which supports guided modes, an alternative route for...
Temporal interfaces introduced by abrupt switching of the constitutive parameters unbounded media enable unusual wave phenomena. So far, their explorations have been mostly limited to lossless media. Yet, non-Hermitian phenomena leveraging material loss and gain, balanced combination in parity-time (PT)-symmetric systems, opening new vistas photonics. Here, we unveil role that temporal offer physics, introducing dual PT symmetry for boundaries. Our findings reveal unexplored interference...
Our ability to generate new distributions of light has been remarkably enhanced in recent years. At the most fundamental level, these patterns are obtained by ingeniously combining different electromagnetic modes. Interestingly, modal superposition occurs spatial, temporal as well spatio-temporal domain. This generalized concept structured is being applied across entire spectrum optics: generating classical and quantum states light, harnessing linear nonlinear light-matter interactions,...
Structural anisotropy in crystals is crucial for controlling light propagation, particularly the infrared spectral regime where optical frequencies overlap with crystalline lattice resonances, enabling light-matter coupled quasiparticles called phonon polaritons (PhPs). Exploring PhPs anisotropic materials like hBN and MoO3 has led to advancements confinement manipulation. In a recent study, monoclinic crystal β-Ga2O3 (bGO) were shown exhibit strongly asymmetric propagation frequency...
By exploiting singular spatial modulations of the graphene conductivity, we design a broadband, tunable THz absorber whose efficiency approaches theoretical upper bound for wide absorption band with fractional bandwidth 185%. Strong field enhancement is exhibited by modes this extended structure, which able to excite wealth high-order surface plasmons, enabling deeply subwavelength focusing incident radiation. Previous studies have shown that conductivity can be modulated at GHz frequencies,...
Time-dependent systems do not in general conserve energy, invalidating much of the theory developed for static and turning our intuition on its head. This is particularly acute luminal space-time crystals, where structure moves at or close to velocity light. Conventional Bloch wave no longer applies, energy grows exponentially with time, a new perspective required understand phenomenology. In this paper, we identify mechanism amplification: compression lines force that are nevertheless...
We report a switchable time-varying mirror, composed of an indium-tin-oxide--gold bilayer, displaying tenfold modulation reflectivity ($\mathrm{\ensuremath{\Delta}}R\ensuremath{\approx}0.6$), which saturates for driving-pump intensity ${I}_{\mathrm{pump}}\ensuremath{\approx}100\phantom{\rule{0.2em}{0ex}}\mathrm{GW}/{\mathrm{cm}}^{2}$. Upon interacting with the saturated frequency content reflected pulse is extended up to 31 THz, well beyond pump spectral (2.8 THz). interpret broadening as...
Abstract An Archimedes’ Screw captures water, feeding energy into it by lifting to a higher level. We introduce the first instance of an optical Screw, and demonstrate how this system is capable capturing light, dragging amplifying it. unveil new exact analytic solutions Maxwell’s Equations for wide family chiral space-time media, show their potential achieve chirally selective amplification within widely tunable parity-time-broken phases. Our work, which may be readily implemented via...
We develop a compact theory that can be applied to variety of time-varying dispersive materials. The continuous-wave reflection and transmission coefficients are replaced with equivalent operator expressions. In addition comparing this approach existing numerical analytical techniques, we find the eigenfunctions these operators represent pulses do not change their spectra after interaction time-varying, material. addition, poles nontime harmonic bound states system.
Extreme anisotropy in some polaritonic materials enables light propagation with a hyperbolic dispersion, leading to enhanced light-matter interactions and directional transport. However, these features are typically associated large momenta that make them sensitive loss poorly accessible from far-field, being bound the material interface or volume-confined thin films. Here, we demonstrate new form of polaritons, leaky nature featuring lenticular dispersion contours neither elliptical nor...
How to hide a dimension from view Compacted dimensions are essential ingredients of advanced string theories; the extra used describe world hidden view, or compacted. Pendry et al. concepts transformation optics, in which metamaterials designed produce specific optical properties, show theoretically that compacted could be possible plasmonic structures. For example, simulations with metallic grating and periodically doped graphene revealed two-dimensional structures exhibit properties bulk...
Conventionally, time-dependent systems add energy to electromagnetic waves by parametric amplification. Here we identify a distinct, alternative mechanism—compression of lines force.
Abstract The advent of novel nonlinear materials has stirred unprecedented interest in exploring the use temporal inhomogeneities to achieve forms wave control, amidst greater vision engineering metamaterials across both space and time. When properties an unbounded medium are abruptly switched time, propagating waves efficiently converted different frequencies, partially coupled their back-propagating phase-conjugate partners, through a process called time-reversal. However, realistic...